Low-delay rate control for DCT video coding via rho-domain source modeling

Citation
Zh. He et al., Low-delay rate control for DCT video coding via rho-domain source modeling, IEEE CIR SV, 11(8), 2001, pp. 928-940
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY
ISSN journal
1051-8215 → ACNP
Volume
11
Issue
8
Year of publication
2001
Pages
928 - 940
Database
ISI
SICI code
1051-8215(200108)11:8<928:LRCFDV>2.0.ZU;2-Q
Abstract
By introducing the new concepts of characteristic rate curves and rate-curv e decomposition, a generic source-modeling framework is developed for trans form coding of videos. Based on this framework, the rate-quantization (R-Q) and distortion-quantization (D-Q) functions (collectively called R-D funct ions in this work) of the video encoder can be accurately estimated with ve ry low computational complexity before quantization and coding. With the ac curate estimation of the R-Q function, a frame-level rate control algorithm is proposed for DCT video coding. The proposed algorithm outperforms the T MN8 rate control algorithm by providing more accurate and robust rate regul ation and better picture quality. Based on the estimated R-D functions, an encoder-based rate-shape-smoothing algorithm is proposed. With this smoothi ng algorithm, the output bit stream of the encoder has both a smoothed rate shape and a consistent picture quality, which are highly desirable in prac tical video coding and transmission.